It arrives as notation.
The first page is usually a state vector and a page of linear algebra, long before there is anything to look at.
Quantum computing, made visible.
Turn a qubit, build a circuit, open a quantum computer. Every idea in Qourse is something you can see and try.
Last gateNone yet
The qubit starts in |0⟩, pointing straight up. Press a gate to turn it.
|0⟩
P(0)
P(1)
Quantum computing is hard to learn, for three honest reasons.
You can't watch a qubit.
Measuring a qubit gives one bit and destroys the state you wanted to see, so intuition never gets a picture to hold on to.
The machine stays a black box.
Most courses stop at the circuit. The pulses, the wiring and the refrigerator that make a qubit real are left out.
The same idea, made visible.
Every symbol in a qubit's state is a direction you can see. Move the two angles and watch the equation, the sphere and the odds change together.
|ψ⟩=cos(θ2)|0⟩+eiφsin(θ2)|1⟩
P(0)
P(1)
Lessons that move. Exercises that answer back.
Every lesson is a sequence of short steps: an animated reading, an exercise on the same screen, and feedback that explains itself.
- 1
A short, animated reading, with the maths written out only when it earns its place. Here: an arrow on a circle fixes both amplitudes of a qubit.
- 2
The exercise sits beside the reading. Turn the state until measuring 1 has a 25% chance. This is the real exercise from the course; take over at any time.
- 3
Feedback explains why, not only whether. Solved activities add up to the skill, and a final challenge marks you proficient.
An arrow at angle θ from the top has amplitudes
a = cos(θ/2), b = sin(θ/2)
From your first qubit to real problems.
- Beginner
Read a qubit
Write a state, read its odds off the Bloch sphere, and see why measuring changes it.
- Intermediate
Build with many
Combine qubits, entangle them, and run the algorithms that make use of it.
- Advanced
Judge real problems
Reformulate a problem for a quantum processor, and decide whether it belongs there at all.
See all skills
One circuit, three views at once.
The gates, the amplitudes as circles and the measurement counts, side by side. Here is a Bell pair on two qubits, one step at a time.
q₀
H
q₁
|00⟩0
|01⟩0
|10⟩0
|11⟩0
Counts, 1,024 shotsSimulated
|00⟩527
|01⟩0
|10⟩0
|11⟩497
Follow the cold all the way down.
Qourse goes past the maths to the machine: a dilution refrigerator that takes a chip from room temperature to about 15 mK. Watch its shells lift away. The full tour, part by part, is inside the course.
A schematic view: this browser cannot run the 3D model (WebGL is off or unavailable).
From one line of code to the chip.
- Code
qc.h(0)One line asks for a Hadamard gate on qubit 0.
- HCircuit
The compiler places it on wire q₀, next to whatever comes after.
- Control electronics
At room temperature it becomes a shaped microwave pulse, tens of nanoseconds long, near the qubit's frequency of about 5 GHz.
- Quantum chip
The pulse travels down the fridge's lines to a superconducting qubit at about 15 mK and turns its state.
One platform, three ways in.
The same lessons, lab and hardware for everyone. Universities and companies get a workspace built around how they teach and work.
Learn it properly, at your own pace.
For students, developers and the curious. Short animated lessons, an exercise after every idea, and a lab where you can test anything you just read.
- Progressive lessons, five minutes at a time
- Feedback that explains why an answer is right or wrong
- A proficiency challenge at the end of each skill
Run a quantum course with the lab built in.
For lecturers and learning platforms. Set lessons and lab challenges as assignments, grade write-ups against a rubric, and see progress by student and by skill.
- Instructor and student views of the same course
- Assignments, challenges and grading in one place
- Mastery by student and skill, ready to export
Train a team, then run real experiments.
For engineering and research teams. Advanced lessons and simulations, experiments you can save and share, a job queue, and dashboards for the whole team.
- Experiments on an exact simulator, results marked as simulated
- A job queue designed to connect to real quantum processors
- Team progress and usage in one dashboard
Plans for individual learners.
Yearly saves 34%
Free
$0
No card needed
- One full skill: Foundations
- The first lesson of every other skill
- The Bloch sphere and a one-qubit circuit in the Qubit Lab
- Progress synced across your devices
Start learning freeUpgrade to Premium any time
Premium
Launch offer: 50% off. About $9.92 a month, billed yearly.
- Every skill and every lesson
- The whole Qubit Lab: circuits, amplitudes and 3D hardware
- Proficiency challenges for each skill
- Your full record, ready to export
Secure payment with Stripe
Teaching a course or training a team?
Do I need a physics or maths background?
No. If you are comfortable with school algebra you can start. Complex numbers and matrices are introduced the moment a lesson needs them, with a worked example each time.
What is in the free plan?
One full skill, Foundations, plus the first lesson of every other skill, and in the Qubit Lab the Bloch sphere and a one-qubit circuit. Premium opens every skill and the whole lab, with more qubits and the 3D hardware: during the launch offer, $14.99 a month or $119 a year.
Is the lab running on a real quantum computer?
No, and the lab says so. It is an exact state-vector simulator running in your browser. Each run of shots is sampled from the exact probabilities, so you see real shot noise but none of a device's errors. Company workspaces are designed to connect to real quantum processors; every simulated result is marked as simulated.
Can I use Qourse for a class or a team?
Yes. Universities get instructor and student views with assignments, grading and progress by student and skill. Companies get a team workspace with experiments, a job queue and team dashboards. Tell us about your group and we will set it up with you.